Adjustable platform



FIG. 1 is a front perspective view of the design of an adjustable platform;

FIG. 2 is a front perspective view of the design in a collapsed position;

FIG. 3 is a front view of the design;

FIG. 4 is a back view of the design;

FIG. 5 is a left side view of the design;

FIG. 6 is a right side view of the design;

FIG. 7 is a top view of the design;

FIG. 8 is a bottom view of the design; and,

FIG. 9 is a front perspective view of the design in an exemplary environment.

The dashed or broken lines in the drawings illustrate structure or environment that do not form part of the claimed design. 

CLAIM We claim the ornamental design for an adjustable platform, as shown and described. 